TOKYO (AP) — Defending champion Agnieszka Radwanska of Poland overpowered Angelique Kerber of Germany 6-1, 6-1 to return to the final of the Pan Pacific Open on Friday.

Nadia Petrova of Russia beat Sam Stosur 6-4, 6-2 in the other semifinal.

Petrova will play for her 12th career title. It's the second time she's beaten two top-10 players in the same week — No. 7 Sara Errani and No. 9 Stosur — but she's never beaten three.

"Nadia has been playing great tennis the whole week," Radwanska said. "I'm very, very happy I could reach the final and fight for the title again. I'll try my best."

The third-seeded Radwanska faced little resistance against the fifth-seeded Kerber, who advanced to the semis after top-ranked Victoria Azarenka withdrew on Thursday after a bout of dizziness in her third-round match on Wednesday.

Radwanska dominated from the outset, breaking Kerber six times including in the final game when Kerber played some of her best tennis, staving off three match points.

Despite the relative ease with which she won, Radwanska said it was tougher than it appeared.

"We played before and it's always tough against her," Radwanska said. "I had to run a lot. She's a great player and I really had to stay focused."

Petrova set the pace early when she broke Stosur in the first game and had nine aces en route to the victory in Ariake Coliseum.

Any chance for a comeback by Stosur was dashed when Petrova broke the ninth-seeded Australian in the seventh game of the second set to go up 5-2.

"When I arrived here, I wasn't sure if I was going to be able to play at all because I didn't feel well," Petrova said. "But I got stronger and stronger with every match and am happy to be in the final."